Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d72ee50088e613…

MALICIOUS

PDF

43.5 KB Created: 2020-08-30 22:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 48e3aad017d31e2ef12daa49bb5ac2f9 SHA-1: 006dc5ff8e137e22e49ee5e15465585506216401 SHA-256: e6d72ee50088e613da31af6cb74e168935e90ad17cd2b8e126609925287b0856
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a malicious redirector link disguised as a download lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. The presence of a visual download button and the document body text referencing 'Mad max font' suggest a social engineering tactic to entice users to click the link. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is likely part of a link farm to improve SEO for the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=mad+max+font In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a86d8827fcc54690a3be15e679b07105.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4dd980_769b9479ff5b45bd974cbfc090df0212.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2e4eb4_f401b7aae0fb4d1dab9d5b14fb27f401.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a44510_f15be3650e544952913f60af3b08b2ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7a11b0_f1cc918b34644ffaac31b76e96383fe6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/429b25_5a7b415503f34da8856a6299fbe84cc4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/69695d_a1a9399fe557446e845851a2d3f44f4e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b88e3d_2ae9f8f475d84070bca13a72bf4cfaee.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b7182_10e4de352284439f96a1f9cc354c9bb9.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5780 4820 bytes
SHA-256: 6fd3d1b1e33626f8d3d7fbaef145df33fc2a691a41e5b5befc4deae6f9b3f5a7
font_01_sfnt_off000067e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E9 10968 bytes
SHA-256: 1607a76d1a755a33d85c7d5c1c2b22f9b7b3b26f29f1b81c6de63f7a371e12ae
font_02_sfnt_off00008d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D11 16084 bytes
SHA-256: fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3